:root {
  --bg: #ffffff;
  --fg: #1b1f24;
  --muted: #5b6573;
  --card: #f5f7fa;
  --line: #e1e5ea;
  --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --fg: #e8ebef;
    --muted: #9aa4b2;
    --card: #181c22;
    --line: #2a303a;
    --accent: #6ea0ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px;
}

.brand { font-weight: 700; letter-spacing: .02em; }

.lang { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.lang button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 6px 12px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.lang button[aria-pressed="true"] { background: var(--accent); color: #fff; }

main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }

.hero { padding: 48px 0 24px; }
.hero h1 { font-size: clamp(2rem, 6vw, 3rem); line-height: 1.2; margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 1.1rem; margin: 0; }

section { padding: 24px 0; }
h2 { font-size: 1.25rem; margin: 0 0 12px; }

.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  display: block;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: inherit;
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card.static:hover { border-color: var(--line); }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0 0 10px; color: var(--muted); font-size: .95rem; }
.tags { font-size: .8rem; color: var(--accent); }

.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.chips li { padding: 4px 12px; background: var(--card); border: 1px solid var(--line); border-radius: 999px; font-size: .9rem; }

.links { list-style: none; display: flex; gap: 20px; padding: 0; margin: 0; }

footer { padding: 32px 16px 48px; color: var(--muted); }